Belt rotating device, transfer device, and image forming apparatus

Abstract

A belt rotating device includes: a meandering correction roller that is rotatably supported within a support frame and is one of a plurality of rollers that stretch an endless belt; a supporting portion that is provided at the support frame and supports a rotating shaft of the meandering correction roller so as to be able to incline the rotating shaft of the meandering correction roller in a one direction; a collar member that is provided on the rotating shaft of the meandering correction roller, contacts the side end of the endless belt in which meandering has occurred, and moves in an axial direction; and an inclination guide portion that is supported by the support frame and has an inclined surface downward and inclined with respect to the shaft of the meandering correction roller, in a position in which the contact portion of the collar member contacts the inclination guide portion.

What is claimed is: 
     
       1. A belt rotating device comprising:
 a meandering correction roller that is rotatably supported within a support frame and is one of a plurality of rollers that stretch an endless belt; 
 a collar member that is provided on a rotating shaft of the meandering correction roller, contacts an end of the endless belt in which meandering has occurred, and moves in an axial direction; and 
 a contact member that is supported by the support frame and has an inclined surface oriented in one direction and inclined with respect to the rotating shaft, in a position in which a portion of the collar member contacts the contact member. 
 
     
     
       2. The belt rotating device according to  claim 1 , wherein:
 the collar member includes a first collar member and a second collar member that are arranged adjacent to each other on the rotating shaft; and 
 the first collar member contacts the endless belt; 
 the second collar member contacts the contact member and is restricted from rotating with respect to the rotating shaft. 
 
     
     
       3. The belt rotating device according to  claim 2 , wherein a low friction member is inserted between the first collar member and the second collar member. 
     
     
       4. The belt rotating device according to  claim 1 , wherein:
 the contact member has a horizontal surface on an upper portion of the inclined surface; and 
 the collar member contacts the horizontal surface without meandering. 
 
     
     
       5. The belt rotating device according to  claim 1 , wherein at least one of the collar member and the contact member includes a restricting portion that restricts a movement range of the collar member. 
     
     
       6. The belt rotating device according to  claim 1 , wherein the meandering correction roller and the rotating shaft rotate integrally. 
     
     
       7. A transfer device comprising the belt rotating device according to  claim 1 , wherein the endless belt is a transfer belt onto which a toner image is transferred. 
     
     
       8. An image forming apparatus comprising the transfer device according to  claim 7 .